Kurt Krasavage
Structural Option
Wisconsin Place Residential
Chevy Chase, MD
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User Note:Note: "While great efforts have been taken to provide accurate and complete information on the pages of CPEP, please be aware that the information contained herewith is considered a work‐in‐progress for this thesis project. Modifications and changes related to the original building designs and construction methodologies for this senior thesis project are solely the interpretation of Kurt Krasavage. Changes and discrepancies in no way imply that the original design contained errors or was flawed. Differing assumptions, code references, requirements, and methodologies have been incorporated into this thesis project; therefore, investigation results may vary from the original design.” |
General Building Data
- Building Name: Wisconsin Place Residential
- Building Location: Friendship Heights, Chevy Chase, Montgomery County, Maryland
- Building Occupants: Private Residents
- Building Function: Residential Multi-Family Tower
- Size: 479,723 S.F.
- Height: 15 stories and 142'-11-1/2" tall
- Dates of Construction:
- Project Cost:
- Project Delivery Method:
Project Team
- Owner/Developer: Archstone-Smith
- Architect: SK&I Architectural Design Group
- Landscape Architect: Carol R. Johnson Associates
- Structural Engineer: Smislova, Kehnemui & Associates, PA
- MEP Engineer: G H T Limited
- Civil Engineer: Loiederman Soltesz Associates
- Interior Designers: Handel Architects
- General Contractor: Turner Construction
Architecture
- Description:
The apartment residences at Wisconsin Place redefine the way you live in a city. Walk one way, and you’re at world-class restaurants and shopping; walk another and you’re on a winding jogging trail; a few more steps and you’re at the on-site Metro – and all that the District has to offer just minutes away. A mountain bike, a designer wardrobe and penchant for great food. Your life. Your choice. All at your doorstep.
The 432 rental apartments at Wisconsin Place include studio, one-, and two-bedroom units, with an exclusive selection of penthouses. The residences will be housed in one U-shaped building varying from 4 levels to 15 stories.
On-site amenities include a full-service concierge, 24-hour front desk attendant, a private exercise facility, a resident library and a fully equipped business center. The apartments are equally as pleasing on the inside, with a wide array of features that are sure to make you feel right at home.
- Applicable Codes:
- 2003 IBC International Building Code
- ASCE 7-02
- 2000 International Fire Code
- 1996 NFPA-72
- 1997 NFPA-101
- 1996 NFPA-13
- 2003 International Mechanical Code
- 2002 NFPA National Electrical Code
- WSSC Plumbing Code
- 2003 ICC International Energy Conservation Code
- Fair Housing Act Design Manual
- Montgomery County, Maryland Zoning Ordinance
- Zoning and Historical:
Wisconsin Place Residential is Primarily zoned as R2- Residential MultiFamily -Tower and A3- Assembly without fixed seating.
- Building Envelope:
The building envelope of Wisconsin Place Residential is primarily a glass curtain wall with masonry. The roof is mild reinforced concrete.
Construction Methods
The delivery method could be best described as GMP (Guaranteed Maximum Price) for Wisconsin Place Residential. The Construction started in May of 2006 and is expected to be completed in February of 2009.
Structural System
Foundations
The foundation shall be supported on spread footings. Column and wall footings supported by rock shall be designed for a bearing pressure of 40,000 PSF. A
4-inch gravel base shall be provided below floor slabs as a moisture barrier. Also, under-floor sub-drainage system shall be installed. All exterior footings shall be a minimum of 2’-6” below grade. All controlled compacted fill shall be compacted to not less than 95% of the maximum dry density determined in accordance with ASTM D-698.
Floor Systems
1st Floor:
Slab on grade.
2nd - 12th Floor:
Flat plate 7 ½” thick unbounded post-tension slabs, with a two-way bottom reinforcement mat of #4@24” continuous bars each way. Hooked bars at discontinuous ends are provided along with 2 #5 top and bottom additional bars along free slab edges. Concrete for slabs shall be normal weight concrete at 5000 psi. The post-tension cables consist of uniform tendons being pulled in the S-N direction and the banded tendons are in the pulled in the W-E direction of the building. The typical uniform cables are 15.0 klf and the banded cables range from approximately 50 - 400 kips.
13th Floor:
Floors are typically post-tensioned the same as the 2nd - 12th except in the pool area. The 12” and 15” slab areas require #5@24” O.C. each way continuous on top and bottom. The 23” slab area requires #6@12” O.C. each way continuous on top and bottom.
Pool House Roof:
7” slab with normal weight concrete and 60,000 psi reinforcing steel. A top and bottom mat of #4@12” O.C. continuous each way is required. Additional top reinforcing for column and middle strips is 6#5 top bars.
14th and 15th Floors:
Floors are typically post-tensioned the same as the 2nd - 12th.
Main Roof:
Slab is 8” thick unbounded post tensioned with a two-way bottom reinforcement of #4@24” continuous each way. For the 10” and 12” thick areas, #5@24” continuous mats are required as well as 2 #6 top and bottom additional bars along free slab edges.
Columns
The columns in Wisconsin Place Residential are primarily standard reinforced concrete with varying sizes, shape, and reinforcement depending on their location and loads that are applied throughout the building. The most typical shapes are 16”x28” and 16”x32”. The reinforcement for the columns varies from floor to floor. The typical reinforcement is 8#7 or 8#8 bars, but varies throughout typical levels. The 12th – 13th floor reinforcement is typically #10 or #11 bars, due to the fact that they are supporting the pool. The loads vary greatly from column to column and are as large as 1380k and as small as 122k for dead loads and 293k to 17k for live loads at the top of the pad.
Mechanical System
The mechanical system contains 24 Heat pumps ranging from 1-1/2 to 6 tons. There are also 5 rooftop units ranging from 2600 to 5100CFM. The 2 Cooling Towers consisting of 1450 GPM adequetly cool Wisconsin Place Residential. Along with all of this there is one 40 MBH Gas fired unit.
Electrical/Lighting System
The building is supplied by 4000A busways, 120/208V, 3 phase, 4 wire system. There is an emergency generator that is a 4- Cycle, diesal power unit producint 350kw of continuous standby power at 265/460V. General, Apartment, Exterior, and public areas contain 120V and 265V luminaires with the majority of them being manufactured by Lithonia and Progress.
Fire Protection System
The entire building is fully spriklered with an automatic wetpipe sprinkler system. Also there are automatic ceiling mounted smoke detectors in each residential space. There are automatic smoke detectors with air flow probes mounted in the electrical ductwork which will help reduce the damage caused by a fire.
Transportation System
3 - Stair Towers in the South Wings of the building as well as the core of 5- elevators in the center of the East-West section of the building provide vertical access to all floors for the residents.